More than any other feature, Half Dome is what I think of when someone mentions Yosemite. Gouged out of granite by a glacier millions of years ago it dominates the entire valley. I don't think there is a bad time of year to visit Yosemite, but winter is my favorite. The crowds are gone, the valley is dressed in a white blanket of snow, the beauty of the park is almost overwhelming. And the last rays of a winter sun on Half Dome ... my favorite view in the world.